linux-kernel - Re: [PATCH v2 03/10] gpio: aggregator: add read-only 'dev

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Message-ID: <rejcrhomapkfyho55bedlfo5cqqly2opzkkym44mqqpsofzjmc@pylnreerkpcc>
Date: Tue, 4 Feb 2025 23:44:49 +0900
From: Koichiro Den <koichiro.den@...onical.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-gpio@...r.kernel.org, geert+renesas@...der.be, 
	linus.walleij@...aro.org, maciej.borzecki@...onical.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 03/10] gpio: aggregator: add read-only 'dev_name'
 configfs attribute

On Tue, Feb 04, 2025 at 01:49:22PM GMT, Bartosz Golaszewski wrote:
> On Mon, Feb 3, 2025 at 4:12 AM Koichiro Den <koichiro.den@...onical.com> wrote:
> >
> > Add a read-only 'dev_name' attribute to configfs interface, which
> > exposes the platform bus device name. Users can easily identify which
> > gpiochip<N> has been created as follows:
> >
> > $ cat /sys/kernel/config/gpio-aggregator/<aggregator-name>/dev_name
> >   gpio-aggregator.0
> > $ ls -d /sys/devices/platform/gpio-aggregator.0/gpiochip*
> >   gpiochip3
> >
> > Signed-off-by: Koichiro Den <koichiro.den@...onical.com>
> > ---
> >  drivers/gpio/gpio-aggregator.c | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >
> > diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
> > index c63cf3067ce7..76d3a8677308 100644
> > --- a/drivers/gpio/gpio-aggregator.c
> > +++ b/drivers/gpio/gpio-aggregator.c
> > @@ -732,6 +732,23 @@ static struct configfs_attribute *gpio_aggr_line_attrs[] = {
> >         NULL
> >  };
> >
> > +static ssize_t
> > +gpio_aggr_device_dev_name_show(struct config_item *item, char *page)
> > +{
> > +       struct gpio_aggregator *aggr = to_gpio_aggregator(item);
> > +       struct platform_device *pdev;
> > +
> > +       guard(mutex)(&aggr->lock);
> > +
> > +       pdev = aggr->pdev;
> > +       if (pdev)
> > +               return sprintf(page, "%s\n", dev_name(&pdev->dev));
> > +
> > +       return sprintf(page, "%s.%d\n", DRV_NAME, aggr->id);
> > +}
> > +
> > +CONFIGFS_ATTR_RO(gpio_aggr_device_, dev_name);
> > +
> >  static ssize_t
> >  gpio_aggr_device_live_show(struct config_item *item, char *page)
> >  {
> > @@ -781,6 +798,7 @@ gpio_aggr_device_live_store(struct config_item *item, const char *page,
> >  CONFIGFS_ATTR(gpio_aggr_device_, live);
> >
> >  static struct configfs_attribute *gpio_aggr_device_attrs[] = {
> > +       &gpio_aggr_device_attr_dev_name,
> >         &gpio_aggr_device_attr_live,
> >         NULL
> >  };
> > --
> > 2.45.2
> >
> 
> I don't understand why this isn't part of the previous patch?

I just separated it to keep the previous one minimal as possible :)
Ok, I'll squash it.

Koichiro

> 
> Bart